2005 MY OBD System Operation Summary for Gasoline Engines

shift, rpm does not go up during a down-shift, or rpm flares during an up-shift), a fault is stored (1-2/2-1 shift -P0781; 2-3/3-2 shift - P0782; 3-4/4-3 shift - P0783; 4-5/5-4 shift - P0784; 5-6/6-5 shift - P0829).Torque Converter ClutchThe Torque Converter Clutch (TCC) Solenoid output circuit is a duty-cycled output that is checked electrically foropen circuit, short circuit to ground, and short circuit to power by monitoring the status of a feedback circuit from theoutput driver (P0740, P2763, P2764). If the TCC pressure is high and the engine torque is low, the TCC should befully applied or have a controlled amount of slippage. If the slip exceeds a threshold, a fault is stored (P0741).Pressure ControlThe Pressure Control solenoid is a variable force solenoid that controls line pressure in the transmission. ThePressure Control solenoid output circuit is a duty-cycled output that is checked electrically for short circuit to groundor short circuit to battery by monitoring the status of a feedback circuit from the output driver (P0962, P0963).Note that the Pressure Control Solenoid failures P0960 and P0963 do not illuminate the MIL because thediagnostic action (maximum line pressure) does not affect emissions.High Side Actuator Control CircuitThe TCM has a high side actuator supply control circuit that can be used to remove power from all 7 solenoids andthe external Reverse Light Relay simultaneously. If the high side actuator control circuit is deactivated, all 7solenoids and the external Reverse Light Relay will be electrically turned off, providing Park, Reverse, Neutral, and3M/5M (in all forward ranges) with maximum line pressure, based on the selected transmission range. Theactuator control circuit is tested for open and short circuits to power and ground. (P0657, P0658, P0659).;!%;!)The TCM monitors itself by using a watchdog circuit and by various software monitoring functions. If there is a fault,a P0613 is stored. The flash ROM is checked using a checksum calculation. If the checksum is incorrect, a P0605fault will be stored. The EEPROM is emulated in the flash ROM. If it is not possible to store information in theEEPROM emulation or if the verification fails, a P062F fault is stored and the ECM is requested to illuminate theMIL immediately. If the diagnostic software tries to enter two contradictory failure mode strategies or if there arecontradictory output states commanded versus the expected output states, a P0701 fault is stored.CAN Communications ErrorThe TCM receives information from the ECM via the high speed CAN network. If the CAN link or network fails, theTCM no longer has torque or engine speed information available. The TCM will store a U0073 fault code and willilluminate the MIL immediately (missing engine speed) if the CAN Bus is off. The TCM will store a U0100 fault codeand will illuminate the MIL immediately (missing engine speed) if it stops receiving CAN messages from the ECM.If the engine speed from the ECM is unreasonably high (> 6,000 rpm), a P0219 fault will be stored.Internal Over TemperatureIf the TCM internal temperature sensor indicates an over temperature condition, the TCM will shut down and a faultwill be stored (P0634). The MIL will be illuminated immediately.Internal TCM Power SupplyIf the power supply voltage is outside of the specified 9 to 16 volt range, a fault will be stored (P0562, P0563).Sensor Supply VoltageIf the sensor supply voltage is too high or too low, a fault will be stored (P0641).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 124 OF 131